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Working with subcommands, configuration management, and cross-platform development forms the foundation of powerful CLI applications in Go. This module introduces essential techniques for building full-fledged command-line tools, including implementing subcommands for complex application structure, managing configuration across different environments, and writing code that works seamlessly across multiple operating systems. The development of user interface enhancements such as terminal spinners, progress bars, and colored output significantly improves the user experience and makes CLI applications more professional and interactive. Through practical projects including a password checker for compromised credentials, an application builder for cross-platform compilation, and a GZIP compression tool, developers gain hands-on experience with real-world CLI patterns. The module emphasizes building applications for multiple operating systems and establishing deployment strategies that ensure broad compatibility. By mastering these foundational concepts, developers prepare for advanced topics in subsequent modules, including leveraging third-party packages and ultimately building AI-based terminal tools as capstone projects.
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Welcome to Module 8 of the Command Line Applications in Go course, the name of which is Building Powerful Command Line Applications, because that's what we're going to be focusing on.
What We'll Learn
In this module, we're going to start introducing a number of topics that will allow us to build full-fledged CLI applications. These topics include:
- Working with subcommands
- Managing configuration
- Writing cross-platform code
- Introducing user interfaces for the terminal, such as:
- Spinners
- Progress bars
- Coloured output
- Looking at how we can build our applications for many different operating systems once they're fully complete
Projects We'll Build
To learn these topics, we're going to be building a number of different CLI applications, including:
- A password checker to see if a given password has been pwned
- An application builder so that we can build different versions of our application for different platforms and operating systems
- A tool to compress and decompress GZIP files
- Many others
Course Progression
By the end of this module, you'll have a good foundation for most of the moving parts when it comes to building CLI applications in Go, which will set us up for success in the final two modules of this course, where we:
- Look at some popular third-party packages to implement a number of the topics that we learn in this module
- Move on to building our final CLI application, which will be basically building our own AI-based tooling that we can use in the terminal
So, without further ado, let's jump in, beginning with looking at one of the more foundational pieces when it comes to building powerful CLI applications.
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